2018-11-03 00:52:48 +08:00
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# RUN: llc %s -run-pass=postra-machine-sink -o - | FileCheck %s
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--- |
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; Module stripped of everything, MIR below is what's interesting
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; ModuleID = '<stdin>'
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source_filename = "justacall.cpp"
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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; Function Attrs: noinline norecurse nounwind uwtable
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define dso_local i32 @main(i32 %argc, i8** nocapture readnone %argv) local_unnamed_addr #0 {
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entry:
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br label %if.end
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if.end:
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br label %return
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return:
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ret i32 0
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}
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!0 = !{!"dummy metadata"}
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!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
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!3 = !DIFile(filename: "justacall.cpp", directory: "/tmp")
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!4 = !{}
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!5 = !{!0}
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!7 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!14 = distinct !DISubprogram(name: "main", scope: !3, file: !3, line: 7, type: !15, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: true, unit: !2, retainedNodes: !20)
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!15 = !DISubroutineType(types: !16)
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!16 = !{!7, !7}
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!20 = !{!21}
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!21 = !DILocalVariable(name: "argc", arg: 1, scope: !14, file: !3, line: 7, type: !7)
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...
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---
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name: main
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alignment: 4
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exposesReturnsTwice: false
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legalized: false
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regBankSelected: false
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selected: false
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failedISel: false
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tracksRegLiveness: true
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hasWinCFI: false
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registers:
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liveins:
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- { reg: '$edi', virtual-reg: '' }
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frameInfo:
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isFrameAddressTaken: false
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isReturnAddressTaken: false
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hasStackMap: false
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hasPatchPoint: false
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stackSize: 0
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offsetAdjustment: 0
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maxAlignment: 0
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adjustsStack: false
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hasCalls: true
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stackProtector: ''
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maxCallFrameSize: 4294967295
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cvBytesOfCalleeSavedRegisters: 0
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hasOpaqueSPAdjustment: false
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hasVAStart: false
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hasMustTailInVarArgFunc: false
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localFrameSize: 0
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savePoint: ''
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restorePoint: ''
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fixedStack:
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stack:
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constants:
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body: |
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bb.0.entry:
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successors: %bb.2(0x40000000), %bb.1(0x40000000)
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liveins: $edi
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; Test that the DBG_VALUE on ebx below is sunk with the def of ebx, despite
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; not being adjacent to the def, see PR38952
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DBG_VALUE $edi, $noreg, !21, !DIExpression()
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renamable $ebx = COPY $edi
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renamable $eax = MOV32r0 implicit-def dead $eflags
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DBG_VALUE $ebx, $noreg, !21, !DIExpression()
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CMP32ri $edi, 255, implicit-def $eflags
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[X86] Merge the different Jcc instructions for each condition code into single instructions that store the condition code as an operand.
Summary:
This avoids needing an isel pattern for each condition code. And it removes translation switches for converting between Jcc instructions and condition codes.
Now the printer, encoder and disassembler take care of converting the immediate. We use InstAliases to handle the assembly matching. But we print using the asm string in the instruction definition. The instruction itself is marked IsCodeGenOnly=1 to hide it from the assembly parser.
Reviewers: spatel, lebedev.ri, courbet, gchatelet, RKSimon
Reviewed By: RKSimon
Subscribers: MatzeB, qcolombet, eraman, hiraditya, arphaman, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D60228
llvm-svn: 357802
2019-04-06 03:28:09 +08:00
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JCC_1 %bb.2, 15, implicit killed $eflags
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2018-11-03 00:52:48 +08:00
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JMP_1 %bb.1
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bb.1.if.end:
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; CHECK-LABEL: bb.1.if.end
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successors: %bb.2(0x80000000)
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liveins: $ebx
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; CHECK: $ebx = COPY $edi
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; CHECK-NEXT: DBG_VALUE $ebx
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renamable $rdx = MOVSX64rr32 renamable $ebx
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renamable $rdx = nsw SHL64ri killed renamable $rdx, 2, implicit-def dead $eflags
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ADJCALLSTACKDOWN64 0, 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
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$rdi = MOV32ri64 0
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$esi = MOV32r0 implicit-def dead $eflags
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CALL64pcrel32 &memset, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, implicit killed $esi, implicit $rdx, implicit-def $rsp, implicit-def $ssp, implicit-def dead $rax
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ADJCALLSTACKUP64 0, 0, implicit-def dead $rsp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $rsp, implicit $ssp
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bb.2.return:
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liveins: $eax
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RET 0, $eax
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...
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